Hi Mike,
If you look at Step 4 in Link number 2, it will show you how to apply the Policy to specific mailboxes.
Infact here is a Virtual Lab at Microsoft that you can go through to see how it works
http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032338956&EventCategory=3&culture=en-US&CountryCode=US
Hope this helps
Thanks
Nitin